The religion known today as "WICCA" is not "pre-Christian."
It is for the most part a 20th Century creation that shares it's roots with "Earth Day" and other feel-good nonsense from the 1960's and '70's.
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The worship of Woden/Wotan/Odin and Frig of the old Germanic and Anglo Saxon peoples is what I am referring to by "Wicca." This religion still has its remnants in the names of the days of the week (e.g., Wednesday) and in seasonal celebrations, e.g, Yule, May Day and Haloween. It was reconstructed in the 20th Century by such people as Johan Jacob Bachofen. But the origin of the word "Witch" is "wicca" meaning "wise" and referred to a practictioner of the old pre Christian religion. So called witches were persecuted by Christians hundreds and hundreds of years ago. In much the same way, Christians presecuted the old Greek religion. Every new religion turns the old gods into demons.